Updated: August 15, 2014 6:24AM
The south and southwest suburbs were drying out Sunday after the second significant storm in the last two weeks soaked the region.
While not packing the powerful winds of the June 30 double derecho that knocked out power to thousands of homes and businesses, the weekend storms dumped almost as much rain in a few hours as the area is accustomed to seeing in an entire month.
For the 48-hour period that ended at 7 a.m. Sunday, 4.6 inches had fallen in Manhattan, almost 3.7 inches in Orland Park, 4.12 inches in Flossmoor and 3.5 inches in Oak Lawn, according to the National Weather Service. Average July full-month precipitation for the Chicago area is 4.9 inches, according to the weather service.
Rainfall last month in the Chicago area, as measured at O’Hare International Airport, was 7.81 inches, more than double the normal 3.45 inches that falls during June, according to the weather service. That included the June 30 storm that dumped, as measured at O’Hare, 2.6 inches.
Heavy rain early Saturday overwhelmed municipal sewer systems, with stormwater backing up into streets. More rain fell Saturday night, and the weather service said there was a chance Monday for afternoon showers and a possible thunderstorm, and afternoon showers were in the forecast for Tuesday.
Tunnels comprising the Metropolitan Water Reclamation District’s “Deep Tunnel” flood control system were emptied in advance of the storm, and captured millions of gallons of rainwater, an MWRD spokeswoman said. A huge new reservoir at the Thornton Quarry that will be part of Deep Tunnel is to be completed next year.
At the First Midwest Bank Amphitheatre in Tinley Park, a planned Saturday night concert by Journey and the Steve Miller Band was postponed due to weather. It was unclear when the event would be rescheduled.
Disappointed fans who’d traveled to Tinley for the concert vented their anger online, with web postings questioning why the cancellation wasn’t publicized on the venue’s website. One woman wrote that she’d flown in with her special-needs daughter “just to see Journey, and we’re going home Journeyless.”